<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript" src="js/jquery-1.11.2.min.js" ></script>
	</head>
	<body>
		<input type="checkbox" name="" id="pas" value=""  onclick="ischecked()"/>
		<div id="tt1">
			sss
		</div>
		
		<script>
				function ischecked(){
					if (document.getElementById("pas").checked) { 
					document.getElementById("tt1").style.display = "block"; 
					} 
					else { 
					document.getElementById("tt1").style.display = "none"; 
					} 
				} 
		</script>
	</body>
	</body>
</html> 
